Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. [sodium and sodium compounds]
8. sodium compounds

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by form
6. materials by chemical form
7. compounds
8. polymers

Anotations

Scope note:

A super-absorbent polymer, the sodium salt of polyacrylic acid, with broad commercial applications. In a conservation context, it is used as a moisture buffer material for humidity control in museum exhibit cases and in historic structures.